Java floating-point numbers representation as a hexadecimal numbers
0x1e3
and 0x1e3d
are hexadecimal integer literals. Note that e
and d
are hexadecimal digits, not the exponent indicator or double
type indicator in this case.
1e3d
is a decimal floating-point literal. The e
is the exponent indicator, the d
says that this is a double
rather than a float
.
The notation 0x1p3
is a way to express a floating-point literal in hexadecimal, as you can read in section 3.10.2 of the Java Language Specification. It means 1 times 2 to the power 3; the exponent is binary (so, it's 2-to-the-power instead of 10-to-the-power).
0x1e3 is hex for 483, as is 0x1e3d hex for 7741. The e
is being read as a hex digit with value 14.